Hello, Shipping header files for a package in inst/include and let other packages use it with LinkingTo is popular. Unfortunately for the package itself, we still need to use something like : PKG_CPPFLAGS+=-I../inst/include/ in the Makevars and Makevars.win files. Could this become automatic ? So if a package has src/ and inst/include/ can we have it so that a -I flag is set accordingly. Would anyone be interested in reviewing a patch against R-devel for such feature ? Romain